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Abstract
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In this work enhanced electrocatalytic oxidation of methanol at reduced graphene oxide-nickel
oxide nanocomposite modified carbon ceramic electrode (rGO-NiO/CCE) was studied by
electrochemical techniques in alkaline medium. Due to some unique properties of carbon ceramic
electrode (CCE) involving high porosity, renewable surface, good conductivity, and economy it
was used as a substrate in this study (1). The composition of reduced graphene oxide with
excellent conductivity and high surface to volume ratio, and NiO results a new nanocomposite
with brilliant performance for electrocatalytic applications. The mechanism of electrocatalytic
oxidation of methanol on rGO-NiO/CCE was investigated and proposed to be done by reaction
with NiOOH and also direct electro-oxidation reaction. The effects of scan rate and methanol
concentration on the anodic peak heights as well as current decay measurements were studied.
Cyclic voltammetry studies demonstrated that the rGO-NiO/CCE exhibits much higher
electrocatalytic activity and stability rather than CCE, rGO/CCE, NiO/CCE in methanol
oxidation.
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